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| author | Sanjay Patel <spatel@rotateright.com> | 2016-10-19 16:58:59 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2016-10-19 16:58:59 +0000 |
| commit | 3a3aaf67e07ade866b9500a9466086a68d0dd70c (patch) | |
| tree | 15006d3cec17160af880cfd3669c039ad95dd5ea /llvm/test/CodeGen/Mips/select.ll | |
| parent | 383803230bba0c0dea3d93d9eb4f97d6fa8f3718 (diff) | |
| download | bcm5719-llvm-3a3aaf67e07ade866b9500a9466086a68d0dd70c.tar.gz bcm5719-llvm-3a3aaf67e07ade866b9500a9466086a68d0dd70c.zip | |
[DAG] optimize negation of bool
Use mask and negate for legalization of i1 source type with SIGN_EXTEND_INREG.
With the mask, this should be no worse than 2 shifts. The mask can be eliminated
in some cases, so that should be better than 2 shifts.
This change exposed some missing folds related to negation:
https://reviews.llvm.org/rL284239
https://reviews.llvm.org/rL284395
There may be others, so please let me know if you see any regressions.
Differential Revision: https://reviews.llvm.org/D25485
llvm-svn: 284611
Diffstat (limited to 'llvm/test/CodeGen/Mips/select.ll')
| -rw-r--r-- | llvm/test/CodeGen/Mips/select.ll | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/llvm/test/CodeGen/Mips/select.ll b/llvm/test/CodeGen/Mips/select.ll index 0ef8f36333f..8c1b0286bb5 100644 --- a/llvm/test/CodeGen/Mips/select.ll +++ b/llvm/test/CodeGen/Mips/select.ll @@ -140,9 +140,10 @@ entry: ; 32R2-DAG: mtc1 $6, $[[F1:f0]] ; 32R2: movn.s $[[F1]], $[[F0]], $4 +; 32R6: sltu $[[T0:[0-9]+]], $zero, $4 +; 32R6: negu $[[T0]], $[[T0]] ; 32R6-DAG: mtc1 $5, $[[F0:f[0-9]+]] ; 32R6-DAG: mtc1 $6, $[[F1:f[0-9]+]] -; 32R6: sltu $[[T0:[0-9]+]], $zero, $4 ; 32R6: mtc1 $[[T0]], $[[CC:f0]] ; 32R6: sel.s $[[CC]], $[[F1]], $[[F0]] |
